Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...453..611h&link_type=abstract
Astrophysical Journal v.453, p.611
Astronomy and Astrophysics
Astronomy
16
Galaxies: Seyfert, Galaxies: Starburst, X-Rays: Galaxies, Galaxies: Active
Scientific paper
We continue to investigate recurrent claims that a substantial number of "normal" star-forming galaxies may have X-ray luminosities in the range 1042-44 ergs s-1. In this installment, we present new spectra of four such emission-line galaxies that were ambiguously classified in the Einstein Extended Medium Sensitivity Survey (EM SS), and find that they all have intermediate-type Seyfert nuclei as evidenced by broad components of their Hα lines. We argue that any of the remaining emission-line galaxies in the EMSS with 1042 < Lχ < 1044 ergs s-1 that were flagged as needing further spectroscopic work are almost certain to have active nuclei as well. We conclude that in these as well as other samples of X-ray-selected emission-line galaxies, X-ray luminosities in excess of 1042 ergs s 1 can and should be attributed to an active nucleus, even in the case that most of the infrared continuum or optical emission-line luminosity is caused by star formation. There is as yet no good evidence for X-ray-luminous starbursts.
Halpern Jules P.
Helfand David J.
Moran Edward C.
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